Table 3.

Percent of Clinically Elevated T-Scores, Means, Standard Deviations, and One-Sample T-Test Results for Children 2–5 years on the BRIEF-P and Individuals 6–18 years on the BRIEF

BRIEF-P (ages 2–5)	αa	%CEb	Mean	SD	tc	p-value	Cohen’s dd
Inhibit	.90	31.82	55.64	13.83	1.91	0.070	0.41
Shift	.85	19.05	51.59	11.16	0.67	0.511	0.14
Emotional Control	.86	15.00	48.09	13.81	−0.65	0.524	−0.14
Working Memory	.88	60.00	65.59	12.78	5.72*	<0.001	1.22
Planning & Organization	.80	31.58	57.23	12.26	2.76	0.012	0.59
Inhibitory Self-Control Index	.92	29.41	52.59	13.92	0.87	0.392	0.19
Flexibility Index	.89	18.75	49.77	12.11	−0.09	0.931	−0.02
Emergent Metacognition Index	.91	73.33	63.27	13.30	4.68*	<0.001	1.00
GEC	.95	52.94	58.27	13.76	2.82	0.010	0.60
BRIEF (ages 6–18)	αa	%CEb	Mean	SD	tc	p-value	Cohen’s dd
Inhibit	.91	29.69	59.16	12.14	6.03*	<0.001	0.75
Shift	.81	40.63	62.05	9.66	9.98*	<0.001	1.25
Emotional Control	.89	10.94	52.36	10.43	1.81	0.075	0.23
Initiate	.80	25.00	57.86	10.24	6.14*	<0.001	0.77
Working Memory	.89	45.31	63.03	10.96	9.51*	<0.001	1.19
Planning & Organization	.90	40.63	61.22	9.83	9.13*	<0.001	1.14
Organization of Materials	.87	14.06	52.13	9.80	1.74	0.088	0.22
Monitor	.83	45.31	62.53	10.82	9.27*	<0.001	1.16
Behavioural Rating Index	.94	21.88	58.36	10.69	6.26*	<0.001	0.78
Metacognition Index	.96	37.50	61.14	9.41	9.47*	<0.001	1.18
GEC	.97	32.81	60.77	9.36	9.20*	<0.001	1.15

^aInternal consistency coefficients, based on normative sample

^bPercentage of individuals with DS reported in the clinically elevated range (≥65)

^cComparison to normative mean T-score of 50.

^dSample SD were used to calculate Cohen’s d.

^*Significant after Bonferroni correction.